Technical Interview

• Review all 11 questions below and choose 5 to answer
• Record a video answering your chosen questions
• Submit your video link through our submission form

1. Java Core Concepts

   Looking at your Java projects, can you explain how you've implemented inheritance and polymorphism? Provide specific examples of where you used abstract classes versus interfaces, and explain your decision-making process.

2. AWS Lambda Implementation

   Walk me through the architecture of one of your AWS Lambda functions. How did you handle cold starts, error handling, and environment variables? What was your strategy for optimizing Lambda performance?

3. DynamoDB Design

   Explain your DynamoDB table design choices in one of your projects. How did you handle relationships between entities, and what considerations went into choosing partition and sort keys? How did you implement efficient querying?

4. Java Collections

   Describe a situation in your projects where you had to choose between different Java collection types. What factors influenced your decision between using ArrayList, LinkedList, HashSet, or TreeMap? How did you optimize for your specific use case?

5. Concurrency Handling

   Show me how you've implemented concurrent operations in your Java applications. How did you handle thread safety, and what synchronization mechanisms did you employ? What challenges did you face?

6. API Design

   Looking at your REST API implementations, explain your approach to versioning, error handling, and documentation. How did you ensure your APIs were both scalable and maintainable?

7. AWS Integration

   Describe how you integrated multiple AWS services in your projects. How did you handle communication between Lambda functions, DynamoDB, and other AWS services? What was your error handling and retry strategy?

8. Testing Strategies

   Walk me through your testing approach for a Java backend service. How did you implement unit tests, integration tests, and what tools did you use? How did you handle testing of AWS Lambda functions and DynamoDB interactions?

9. Performance Optimization

   Explain how you optimized the performance of your Java applications. What metrics did you monitor, what tools did you use for profiling, and what specific optimizations did you implement?

10. Security Implementation

    Describe your approach to security in your Java applications. How did you handle authentication, authorization, and data encryption? What security best practices did you implement for AWS Lambda and DynamoDB?

11. System Design

    Walk me through the system design of one of your larger projects. How did you handle scalability, fault tolerance, and disaster recovery? What considerations went into choosing between synchronous and asynchronous processing?

Video Requirements

• Choose 5 questions from the list above
• Record your responses in a single video
• Keep your total video length under 30 minutes
• Ensure good audio and video quality
• Have your code examples ready to share and discuss

Professional Tips

• Choose a quiet, well-lit environment
• Dress professionally
• Speak clearly and maintain good posture
• Have your GitHub repositories open and ready
• Practice your responses before recording